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* The Dark Bramble and its seeds in ''VideoGame/OuterWilds'' are heavily implied to be this. It's strongly hinted that the bramble was not always the form of the fifth planet in the solar system, and has, in fact, consumed and replaced the previous planetary body with its twisted, spawling EldritchLocation self. Were it not for the sun going supernova every 22 minutes in a time loop, it's likely that the seeds on other planets in the system might inflict the same fates on Timber Hearth and Giant's Deep.


Most parasites use a single living being as their host, which they use to grow, develop their bodies, and finally create many new parasites which will invade another host.

These guys, however, will employ ''a whole planet'' as their [[BodyandHost host]]. Just as our parasites feed on our nutrients to grow, these guys will deplete the planet of its natural resources or its very life force (this is likely to bring bad consequences for the planet's inhabitants), and use them to complete its reproductive cycle, spawning more of its race. Once the cycle has been completed, the newborn will somehow leave the planet to find another one, where they will start a new cycle. Destroying the planet when leaving it is optional.

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Most parasites use a single living being as their host, which they use to grow, develop their bodies, and finally create many new parasites which that will invade another host.

These guys, however, will employ ''a whole planet'' as their [[BodyandHost [[BodyAndHost host]]. Just as our parasites feed on our nutrients to grow, these guys will deplete the planet of its natural resources or its very life force (this is likely to bring bad consequences for the planet's inhabitants), and use them to complete its reproductive cycle, spawning more of its race. Once the cycle has been completed, the newborn will somehow leave the planet to find another one, where they will start a new cycle. Destroying the planet when leaving it is optional.

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* ''VideoGame/{{Stellaris}}'' occasionally spawns a habitable, completely inconspicuous planet that, after a random number of years, suddenly starts shaking, breaking up and releasing noxious gasses into the atmosphere. If you're lucky, these disturbances subside after a while and leave you with a damaged but still habitable world. The more likely outcome is that the planet cracks open like a giant egg and hatches a [[EldritchAbomination Voidspawn]], a hostile Leviathan-class creature that looks like the unholy lovechild of a dragon and a dragonfly. If you leave it alone long enough, it'll eventually start migrating through the galaxy (probably looking for another planet to infest), laying waste to everything in its path.


** The Big Gete Star from ''[[Anime/DragonBallZTheReturnOfCooler The Return of Cooler]]'' probably counts, since it was a mechanical life form that was trying to absorb New Namek.
** The Tree of Might from the [[Anime/DragonBallZTheTreeOfMight movie of the same name]] is another such example, though it devouring the Earth is only a means to harvest its fruit.

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** The Big Gete Star from ''[[Anime/DragonBallZTheReturnOfCooler The Return of Cooler]]'' probably counts, since it was is a mechanical life form that was trying to absorb New Namek.
** The Tree of Might from the [[Anime/DragonBallZTheTreeOfMight movie of the same name]] is another such example, though it devouring sucks all the Earth is only life from a means to harvest its fruit.planet, producing fruit that empowers whoever eats it.



* We have this with ''Anime/KillLaKill'' in the form of life fibers, although it is more like virus than a parasite, in that it [[spoiler:involves them cocooning the Earth and causing it to explode, spreading even more life fibers to other planets]], the which being facilitated by [[BigBad Ragyou Kiryuin]].

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* We have this with ''Anime/KillLaKill'' in the form of life fibers, although it is more like virus than a parasite, in that it [[spoiler:involves them cocooning ''Anime/KillLaKill'': Life fibers ultimately [[spoiler:cocoon the Earth and causing to make it to explode, spreading even more life fibers to other planets]], the which being facilitated by [[BigBad Ragyou Kiryuin]].Kiryuin]] facilitates.


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* In ''Manga/{{Toriko}}'', [[spoiler:the entire Gourmet World]] was spawned by such a parasite. [[spoiler:A meteorite infused with Gourmet Cells struck the original planet Earth long ago. The Gourmet Cells fed off the energy of Earth's mantle and grew new landmass. Gourmet World is a giant tumor that dwarfs its host.]]
* We have this with ''Anime/KillLaKill'' in the form of life fibers, although it is more like virus than a parasite, in that it [[spoiler: involves them cocooning the Earth and causing it to explode, spreading even more life fibers to other planets]], the which being facilitated by [[BigBad Ragyou Kiryuuin]].

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* In ''Manga/{{Toriko}}'', [[spoiler:the entire Gourmet World]] was spawned by such a parasite. [[spoiler:A meteorite infused with Gourmet Cells struck the original planet Earth long ago. The Gourmet Cells fed off the energy of Earth's mantle and grew new landmass. Gourmet World is a giant tumor that dwarfs its host.]]
host]].
* We have this with ''Anime/KillLaKill'' in the form of life fibers, although it is more like virus than a parasite, in that it [[spoiler: involves [[spoiler:involves them cocooning the Earth and causing it to explode, spreading even more life fibers to other planets]], the which being facilitated by [[BigBad Ragyou Kiryuuin]].

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Kiryuin]].
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* Drachicar from Fanfic/SailorMoonZ hatched from the planet Odysseus

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\n[[AC:FanFics]]\n* Drachicar from Fanfic/SailorMoonZ hatched from the planet Odysseus\n\n[[AC:{{Film}}]][[/folder]]

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* In ''Series/KamenRiderGaim,'' the Helheim Forest proves to spread its seeds like wildfire, and there is a very real threat that if the dimensional portals aren't closed, this invasive species could end up turning Earth into a new Helheim. [[spoiler: We know because this is what happened in the formerly-Earthlike world now known as Helheim. Oh, and the monsters used to be that world's people and animals, as anything that eats the fruit of the plants becomes an Inves monster and ends up spreading the seeds further still. Earth has ten years left.]]

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* In ''Series/KamenRiderGaim,'' the Helheim Forest proves to spread its seeds like wildfire, and there is a very real threat that if the dimensional portals aren't closed, this invasive species could end up turning Earth into a new Helheim. [[spoiler: We [[spoiler:We know because this is what happened in the formerly-Earthlike world now known as Helheim. Oh, and the monsters used to be that world's people and animals, as anything that eats the fruit of the plants becomes an Inves monster and ends up spreading the seeds further still. Earth has ten years left.]]

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* The infamous Jenova of ''Videogame/FinalFantasyVII'', from the exact same company that developed the above Chrono Trigger. Jenova shares a few similarities, feeding on the collective life-force of the planet and being directly responsible for the downfall of [[ThePrecursors the Ancients]]. When [[CorruptCorporateExecutive the Shinra Corporation tries to ]] exploit the thing, mistaking it for one of said Ancients, they end up simply creating Sephiroth--[[HumanoidAbomination a new form of Jenova that's smarter, stronger and a]] ''lot'' [[{{Bishonen}} prettier.]]

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* The infamous Jenova of ''Videogame/FinalFantasyVII'', from the exact same company that developed the above Chrono Trigger. Jenova shares a few similarities, feeding on the collective life-force of the planet and being directly responsible for the downfall of [[ThePrecursors the Ancients]]. When [[CorruptCorporateExecutive the Shinra Corporation tries to ]] exploit the thing, mistaking it for one of said Ancients, they end up simply creating Sephiroth--[[HumanoidAbomination a new form of Jenova that's smarter, stronger and a]] ''lot'' [[{{Bishonen}} prettier.]]prettier]].




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** A later addition to the CthulhuMythos, the Worm that Gnaws in the Night, was this to the planet Shaggai, except that it was doing it all by its lonesome; it's so massively powerful that when the Planetoid Abomination Ghroth arrived in its solar system (something which makes every other resident top-tier abomination fully active), the Worm's full awakening resulted in an EarthShatteringKaboom.

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** A later addition to the CthulhuMythos, Franchise/CthulhuMythos, the Worm that Gnaws in the Night, was this to the planet Shaggai, except that it was doing it all by its lonesome; it's so massively powerful that when the Planetoid Abomination Ghroth Ghroth arrived in its solar system (something which makes every other resident top-tier abomination fully active), the Worm's full awakening resulted in an EarthShatteringKaboom.

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** A later addition to the CthulhuMythos, the Worm that Gnaws in the Night, was this to the planet Shaggai, except that it was doing it all by its lonesome; it's so massively powerful that when the Planetoid Abomination Ghroth arrived in its solar system (something which makes every other resident top-tier abomination fully active), the Worm's full awakening resulted in an EarthShatteringKaboom.


* [[EldritchAbomination The Old Gods]] from ''VideoGame/{{Warcraft}}'' are planetary parasites that merge themselves to a planet and slowly corrupt it. They were created by the Void Lords to corrupt nascent Titans gestating within planets as part of their plan to destroy existence. The Old Gods of Azeroth are so deeply connected with the nascent Titan that outright destroying them would kill it as well, so they were instead subdued and sealed.[[note]]More accurately. The Titans were so large and so lacking in subtly that their method of killing the one they did - grabbing ahold and tearing it bodily from the surface - proved so devastating that they daren't try it again. Had they instead killed it in place then cleansed the corruption, the damage (The Well of Eternity) would have been much less sever. Saregas came up with a more direct approach to dealing with Old God infestation, call the planet/titan a lose and cleave the entire thing in two.[[/note]]

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* [[EldritchAbomination The Old Gods]] from ''VideoGame/{{Warcraft}}'' are planetary parasites that merge themselves to a planet and slowly corrupt it. They were created by the Void Lords to corrupt nascent Titans gestating within planets as part of their plan to destroy existence. The Old Gods of Azeroth are so deeply connected with the nascent Titan that outright destroying them would kill it as well, so they were instead subdued and sealed.[[note]]More accurately. accurately: The Titans were so large and so lacking in subtly subtlety that their method of killing the one they did - grabbing ahold and tearing it bodily from the surface - proved so devastating that they daren't try it again. Had they instead killed it in place then cleansed the corruption, the damage (The Well of Eternity) would have been much less sever. Saregas severe. Sargeras came up with a more direct approach to dealing with Old God infestation, infestation: call the planet/titan a lose loss and cleave the entire thing in two.[[/note]]


* Lavos from ''Videogame/ChronoTrigger''. Similar to the previous example, but he doesn't create an alien army, is instead exploited by the planet's mages ([[EvilIsNotAToy doesn't end well]]), and we get to fight some of the offspring before they're launched to other planets.

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* Lavos from ''Videogame/ChronoTrigger''. Similar to the previous example, but he doesn't create an alien army, is instead exploited by the planet's mages ([[EvilIsNotAToy doesn't end well]]), and we the heroes get to fight some of the offspring before they're launched to other planets.


* The ''Franchise/StarTrek'' novel "Prime Directive" gets points for parasitic complexity with a three-species symbiosis: Species A secretly bases on worlds which emit radio transmissions, feeds the Cold War paranoia of the locals through UFO sightings and signal manipulation until the hapless natives nuke each other, then seeds the newly-radioactive environment with Species B, an algae which uses gamma rays the way most plants use sunlight. Species A's signals eventually bring Species C, an immense spacefaring cloud which consumes the algae, and then provides A with transportation and life-support on the way to the next target. The unlucky world is left an irradiated wasteland with much of its organic chemistry sucked away. Spock identifies all three species as non-sapient, and determines that the time needed to evolve their incredibly complex behavior proves they are relics of a prior iteration of the universe.

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* The ''Franchise/StarTrek'' novel "Prime Directive" ''Prime Directive'' gets points for parasitic complexity with a three-species symbiosis: Species A secretly bases on worlds which emit radio transmissions, feeds the Cold War paranoia of the locals through UFO sightings and signal manipulation until the hapless natives nuke each other, then seeds the newly-radioactive environment with Species B, an algae which uses gamma rays the way most plants use sunlight. Species A's signals eventually bring Species C, an immense spacefaring cloud which consumes the algae, and then provides A with transportation and life-support on the way to the next target. The unlucky world is left an irradiated wasteland with much of its organic chemistry sucked away. Spock identifies all three species as non-sapient, and determines that the time needed to evolve their incredibly complex behavior proves they are relics of a prior iteration of the universe.


* The Star Trek novel "Prime Directive" gets points for parasitic complexity with a three-species symbiosis: Species A secretly bases on worlds which emit radio transmissions, feeds the Cold War paranoia of the locals through UFO sightings and signal manipulation until the hapless natives nuke each other, then seeds the newly-radioactive environment with Species B, an algae which uses gamma rays the way most plants use sunlight. Species A's signals eventually bring Species C, an immense spacefaring cloud which consumes the algae, and then provides A with transportation and life-support on the way to the next target. The unlucky world is left an irradiated wasteland with much of its organic chemistry sucked away. Spock identifies all three species as non-sapient, and determines that the time needed to evolve their incredibly complex behavior proves they are relics of a prior iteration of the universe.

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* The Star Trek ''Franchise/StarTrek'' novel "Prime Directive" gets points for parasitic complexity with a three-species symbiosis: Species A secretly bases on worlds which emit radio transmissions, feeds the Cold War paranoia of the locals through UFO sightings and signal manipulation until the hapless natives nuke each other, then seeds the newly-radioactive environment with Species B, an algae which uses gamma rays the way most plants use sunlight. Species A's signals eventually bring Species C, an immense spacefaring cloud which consumes the algae, and then provides A with transportation and life-support on the way to the next target. The unlucky world is left an irradiated wasteland with much of its organic chemistry sucked away. Spock identifies all three species as non-sapient, and determines that the time needed to evolve their incredibly complex behavior proves they are relics of a prior iteration of the universe.


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* ''ComicBook/HeavyMetal'' Volume 2 #5 (September 1978). In the story "Urban Renewal" by Stephen Bissette, giant insects attack a planet and lay their eggs in it. When the eggs hatch, it destroys the planet.


* [[EldritchAbomination The Old Gods]] from ''VideoGame/{{Warcraft}}'' are planetary parasites that merge themselves to a planet and slowly corrupt it. They were created by the Void Lords to corrupt nascent Titans gestating within planets as part of their plan to destroy existence. The Old Gods of Azeroth are so deeply connected with the nascent Titan that outright destroying them would kill it as well, so they were instead subdued and sealed.

to:

* [[EldritchAbomination The Old Gods]] from ''VideoGame/{{Warcraft}}'' are planetary parasites that merge themselves to a planet and slowly corrupt it. They were created by the Void Lords to corrupt nascent Titans gestating within planets as part of their plan to destroy existence. The Old Gods of Azeroth are so deeply connected with the nascent Titan that outright destroying them would kill it as well, so they were instead subdued and sealed. [[note]]More accurately. The Titans were so large and so lacking in subtly that their method of killing the one they did - grabbing ahold and tearing it bodily from the surface - proved so devastating that they daren't try it again. Had they instead killed it in place then cleansed the corruption, the damage (The Well of Eternity) would have been much less sever. Saregas came up with a more direct approach to dealing with Old God infestation, call the planet/titan a lose and cleave the entire thing in two.[[/note]]


* [[EldritchAbomination The Old Gods]] from ''VideoGame/{{Warcraft}}'' are planetary parasites that merge themselves to a planet and slowly corrupt it. They were created by the Void Lords to corrupt nascent Titans gestating within planets as part of their plan to destroy existence. The Old Gods of Azeroth are so deeply connected with the nascent Titan that outright destroying them would kill it as well, so they were instead subdued and sealed.
%%* Jenova from ''Videogame/FinalFantasyVII''.

to:

* The infamous Jenova of ''Videogame/FinalFantasyVII'', from the exact same company that developed the above Chrono Trigger. Jenova shares a few similarities, feeding on the collective life-force of the planet and being directly responsible for the downfall of [[ThePrecursors the Ancients]]. When [[CorruptCorporateExecutive the Shinra Corporation tries to ]] exploit the thing, mistaking it for one of said Ancients, they end up simply creating Sephiroth--[[HumanoidAbomination a new form of Jenova that's smarter, stronger and a]] ''lot'' [[{{Bishonen}} prettier.]]
* [[EldritchAbomination The Old Gods]] from ''VideoGame/{{Warcraft}}'' are planetary parasites that merge themselves to a planet and slowly corrupt it. They were created by the Void Lords to corrupt nascent Titans gestating within planets as part of their plan to destroy existence. The Old Gods of Azeroth are so deeply connected with the nascent Titan that outright destroying them would kill it as well, so they were instead subdued and sealed.
%%* Jenova from ''Videogame/FinalFantasyVII''.
sealed.

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